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Overview
Mining

Sumiseki Holdings,Inc.

Sumiseki Holdings Co., Ltd. is a holding company operating across three business segments: coal trading (through Sumiseki Trading Co., Ltd.), industrial synthetic diamond manufacturing and sales (through Diamond Material Co., Ltd.), and quarrying and stone processing (through Izumiyama Kogyo Co., Ltd.). The group leverages its legacy in resource extraction to supply coal to industrial customers and industrial-use synthetic diamonds to manufacturing sectors. Its diversified materials portfolio spans energy resources and advanced industrial materials.

Market Cap
¥35.3B
US$225M
EV
¥13.3B
US$84.8M
Stock¥590▲+0.68%
US$1 = ¥156.80 (2026-10-23)
LTM EV/EBITDA
27.0
x
LTM EV/EBIT
37.5
x
LTM PER
13.1
x
LTM PBR
1.3
x
Stock vs TOPIX (1Y, base=100)vs TOPIX ▼-21.6%pt
100
Oct 24, 25 – Oct 23, 26StockTOPIX
MC → EV Bridge
35.3BUS$225MMarket Cap0.04BUS$0.22M+ Debt9.73BUS$62.0M− Cash12.3BUS$78.5M− Inv. Sec.13.3BUS$84.8MEV
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Performance & Balance
Revenue 5Y (¥B)
12.4US$79.1M'22/339.9US$254M'23/322.6US$144M'24/310.3US$65.5M'25/310.7US$68.0M'26/3
EBITDA 5Y (¥B)
2.45US$15.6M'22/33.95US$25.2M'23/38.12US$51.8M'24/30.18US$1.12M'25/30.47US$2.98M'26/3
Net Income 5Y (¥B)
2.27US$14.5M'22/33.67US$23.4M'23/37.53US$48.0M'24/34.20US$26.8M'25/32.64US$16.8M'26/3
Capital Structure
100%
EquityD/E 0.00xDebt
Liquidity vs Debt 5Y (¥B)▲ Net Cash
CashInv. Sec.Debt
6.09US$38.8M1.81US$11.5M'22/36.48US$41.3M2.98US$19.0M'23/321.6US$138M0.14US$0.87M'24/318.2US$116M0.06US$0.40M'25/315.2US$96.8M0.04US$0.22M'26/3
Shareholders
Top 10 hold 70.5%
as of 2026-03-31 · Source: Annual Securities Report
1
Aso Corporation
56.91%
2
The Master Trust Bank of Japan, Ltd. (Trust Account)
3.44%
3
Sumitomo Mitsui Card Company, Limited
2.81%
4
Sumitomo Mitsui Banking Corporation
2.21%
5
The Japan Research Institute, Limited
1.40%
6
Rakuten Securities, Inc. (Joint Account)
0.99%
7
Morgan Stanley MUFG Securities Co., Ltd.
0.90%
8
SBI SECURITIES Co., Ltd.
0.63%
9
Masatoshi OSAWA
0.61%
10
Nomura Securities Co., Ltd.
0.55%
Management
9 officers
Shosuke MORI
Representative Director, President
As stated in Item 1
1959-05-22
Kazunari ISOBUCHI
Director
As stated in Item 1
1967-09-07
Yoshinori MIYAZAWA
Director
As stated in Item 1
1970-08-27
Iwao ASO
Director
As stated in Item 1
1974-07-17
Takashi SAKANE
Director
Apr 1993 Joined Sakura Bank, Ltd. (now Sumitomo Mitsui Banking Corporation) Apr 2009 Seconded to Aso Co., Ltd. under the bank's corporate secondment program (3 years) Aug 2012 Joined Aso Co., Ltd. Dec 2018 General Manager, Medical Business Development Department, Aso Co., Ltd. Jul 2022 Executive Officer and General Manager, Medical Business Development Department, Aso Co., Ltd. (current) Jun 2026 Director of the Company (current)
1971-03-11
Yukio NAKAMURA
Director
As stated in Item 1
1949-01-02
Kanji NOGUCHI
Director and Audit and Supervisory Committee Member (Full-time)
As stated in Item 1
1960-12-04
Munenosuke KAMIYA
Director and Audit and Supervisory Committee Member
As stated in Item 1
1974-06-25
Koichi SENDA
Director and Audit and Supervisory Committee Member
As stated in Item 1
1964-10-31
Large Shareholding Reports
No filings
Disclosures
No disclosures
Primary Source Filings
TDnet
2026-07-31
Q1 Earnings Flash
FY ending Mar 2027
View PDF →
EDINET
2026-06-25
Annual Securities Report
Period: Apr 2025 – Mar 2026
View PDF →
TDnet
2026-01-30
Q3 Earnings Flash
FY ending Mar 2026
View PDF →
EDINET
2025-11-07
Semi-Annual Securities Report
Period: Apr 2025 – Mar 2026
View PDF →
TDnet
2025-07-31
Q1 Earnings Flash
FY ending Mar 2026
View PDF →
EDINET
2025-06-27
Annual Securities Report
Period: Apr 2024 – Mar 2025
View PDF →
TDnet
2025-01-30
Q3 Earnings Flash
FY ending Mar 2025
View PDF →
EDINET
2024-11-07
Semi-Annual Securities Report
Period: Apr 2024 – Mar 2025
View PDF →
TDnet
2024-07-25
Q1 Earnings Flash
FY ending Mar 2025
View PDF →
EDINET
2024-06-27
Annual Securities Report
Period: Apr 2023 – Mar 2024
View PDF →
EDINET
2024-02-07
Quarterly Securities Report
Period: Oct 2023 – Dec 2023
View PDF →
EDINET
2023-11-07
Quarterly Securities Report
Period: Jul 2023 – Sep 2023
View PDF →
EDINET
2023-08-04
Quarterly Securities Report
Period: Apr 2023 – Jun 2023
View PDF →
EDINET
2023-06-29
Annual Securities Report
Period: Apr 2022 – Mar 2023
View PDF →
EDINET
2023-02-06
Quarterly Securities Report
Period: Oct 2022 – Dec 2022
View PDF →
EDINET
2022-11-07
Quarterly Securities Report
View PDF →
EDINET
2022-08-05
Quarterly Securities Report
View PDF →
EDINET
2022-06-29
Annual Securities Report
View PDF →
EDINET
2022-02-04
Quarterly Securities Report
View PDF →
EDINET
2021-11-05
Quarterly Securities Report
View PDF →
EDINET
2021-08-06
Quarterly Securities Report
View PDF →
EDINET
2021-06-29
Annual Securities Report
View PDF →
EDINET
2021-02-05
Quarterly Securities Report
View PDF →
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